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<pre><span class="comment"> /****************************************************************************
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 ** Copyright (C) 2004-2008 Trolltech ASA. All rights reserved.
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** included in the packaging of this file.  Alternatively you may (at
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 #include &quot;bencodeparser.h&quot;

 #include &lt;QList&gt;
 #include &lt;QMetaType&gt;

 BencodeParser::BencodeParser()
 {
 }

 bool BencodeParser::parse(const QByteArray &amp;content)
 {
     if (content.isEmpty()) {
         errString = QString(&quot;No content&quot;);
         return false;
     }

     this-&gt;content = content;
     index = 0;
     infoStart = 0;
     infoLength = 0;
     return getDictionary(&amp;dictionaryValue);
 }

 QString BencodeParser::errorString() const
 {
     return errString;
 }

 QMap&lt;QByteArray, QVariant&gt; BencodeParser::dictionary() const
 {
     return dictionaryValue;
 }

 QByteArray BencodeParser::infoSection() const
 {
     return content.mid(infoStart, infoLength);
 }

 bool BencodeParser::getByteString(QByteArray *byteString)
 {
     const int contentSize = content.size();
     int size = -1;
     do {
         char c = content.at(index);
         if (c &lt; '0' || c &gt; '9') {
             if (size == -1)
                 return false;
             if (c != ':') {
                 errString = QString(&quot;Unexpected character at pos %1: %2&quot;)
                     .arg(index).arg(c);
                 return false;
             }
             ++index;
             break;
         }
         if (size == -1)
             size = 0;
         size *= 10;
         size += c - '0';
     } while (++index &lt; contentSize);

     if (byteString)
         *byteString = content.mid(index, size);
     index += size;
     return true;
 }

 bool BencodeParser::getInteger(qint64 *integer)
 {
     const int contentSize = content.size();
     if (content.at(index) != 'i')
         return false;

     ++index;
     qint64 num = -1;
     bool negative = false;

     do {
         char c = content.at(index);
         if (c &lt; '0' || c &gt; '9') {
             if (num == -1) {
                 if (c != '-' || negative)
                     return false;
                 negative = true;
                 continue;
             } else {
                 if (c != 'e') {
                     errString = QString(&quot;Unexpected character at pos %1: %2&quot;)
                         .arg(index).arg(c);
                     return false;
                 }
                 ++index;
                 break;
             }
         }
         if (num == -1)
             num = 0;
         num *= 10;
         num += c - '0';
     } while (++index &lt; contentSize);

     if (integer)
         *integer = negative ? -num : num;
     return true;
 }

 bool BencodeParser::getList(QList&lt;QVariant&gt; *list)
 {
     const int contentSize = content.size();
     if (content.at(index) != 'l')
         return false;

     QList&lt;QVariant&gt; tmp;
     ++index;

     do {
         if (content.at(index) == 'e') {
             ++index;
             break;
         }

         qint64 number;
         QByteArray byteString;
         QList&lt;QVariant&gt; tmpList;
         QMap&lt;QByteArray, QVariant&gt; dictionary;

         if (getInteger(&amp;number))
             tmp &lt;&lt; number;
         else if (getByteString(&amp;byteString))
             tmp &lt;&lt; byteString;
         else if (getList(&amp;tmpList))
             tmp &lt;&lt; tmpList;
         else if (getDictionary(&amp;dictionary))
             tmp &lt;&lt; qVariantFromValue&lt;QMap&lt;QByteArray, QVariant&gt; &gt;(dictionary);
         else {
             errString = QString(&quot;error at index %1&quot;).arg(index);
             return false;
         }
     } while (index &lt; contentSize);

     if (list)
         *list = tmp;
     return true;
 }

 bool BencodeParser::getDictionary(QMap&lt;QByteArray, QVariant&gt; *dictionary)
 {
     const int contentSize = content.size();
     if (content.at(index) != 'd')
         return false;

     QMap&lt;QByteArray, QVariant&gt; tmp;
     ++index;

     do {
         if (content.at(index) == 'e') {
             ++index;
             break;
         }

         QByteArray key;
         if (!getByteString(&amp;key))
             break;

         if (key == &quot;info&quot;)
           infoStart = index;

         qint64 number;
         QByteArray byteString;
         QList&lt;QVariant&gt; tmpList;
         QMap&lt;QByteArray, QVariant&gt; dictionary;

         if (getInteger(&amp;number))
             tmp.insert(key, number);
         else if (getByteString(&amp;byteString))
             tmp.insert(key, byteString);
         else if (getList(&amp;tmpList))
             tmp.insert(key, tmpList);
         else if (getDictionary(&amp;dictionary))
             tmp.insert(key, qVariantFromValue&lt;QMap&lt;QByteArray, QVariant&gt; &gt;(dictionary));
         else {
             errString = QString(&quot;error at index %1&quot;).arg(index);
             return false;
         }

         if (key == &quot;info&quot;)
           infoLength = index - infoStart;

     } while (index &lt; contentSize);

     if (dictionary)
         *dictionary = tmp;
     return true;
 }</pre>
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